TrackingParticleIP.h

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#ifndef SimTracker_TrackAssociation_TrackingParticleIP
#define SimTracker_TrackAssociation_TrackingParticleIP

// This file is in this package only because ParametersDefinerForTP is

#include <cmath>

namespace TrackingParticleIP {
  // As in TrackBase::dxy(Point) and dz(Point)
  template <typename T_Vertex, typename T_Momentum, typename T_Point>
  inline auto dxy(const T_Vertex& vertex, const T_Momentum& momentum, const T_Point& point) {
    return -(vertex.x()-point.x())*std::sin(momentum.phi()) + (vertex.y()-point.y())*std::cos(momentum.phi());

  }

  template <typename T_Vertex, typename T_Momentum, typename T_Point>
  inline auto dz(const T_Vertex& vertex, const T_Momentum& momentum, const T_Point& point) {
    return vertex.z()-point.z() - ( (vertex.x()-point.x())*momentum.x() +
                                    (vertex.y()-point.y())*momentum.y() ) * momentum.z()/momentum.perp2();
  }
}

#endif